//全局样式

html,body{
    margin:0px;
    padding:0px;
    width:100%;
    height:100%;
}
body{
    background-image:url(../images/banner.jpg);
    background-size:cover;
    background-position:center;
    font:14px 'microsoft yahei';
    color:#4d4d4d;
    font-weight:300;
}